405 lines
10 KiB
C
405 lines
10 KiB
C
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/**********************************************************************
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*
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* GEOS - Geometry Engine Open Source
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* http://geos.osgeo.org
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*
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* Copyright (C) 2020 Paul Ramsey <pramsey@cleverelephant.ca>
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*
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* This is free software; you can redistribute and/or modify it under
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* the terms of the GNU Lesser General Public Licence as published
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* by the Free Software Foundation.
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* See the COPYING file for more information.
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*
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**********************************************************************/
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#pragma once
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#include <cstdint>
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#include <geos/geom/Location.h>
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#include <geos/geom/Position.h>
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#include <geos/export.h>
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using geos::geom::Location;
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using geos::geom::Position;
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namespace geos { // geos.
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namespace operation { // geos.operation
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namespace overlayng { // geos.operation.overlayng
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/**
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* A label for a pair of {@link OverlayEdge}s which records
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* the topological information for the edge
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* in the {@link OverlayGraph} containing it.
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* The label is shared between both OverlayEdges
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* of a symmetric pair.
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* Accessors for orientation-sensitive information
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* require the orientation of the containing OverlayEdge.
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*
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* A label contains the topological {@link geom::Location}s for
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* the two overlay input geometries.
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* A labelled input geometry may be either a Line or an Area.
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* In both cases, the label locations are populated
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* with the locations for the edge {@link geom::Position}s
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* once they are computed by topological evaluation.
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* The label also records the dimension of each geometry,
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* and in the case of area boundary edges, the role
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* of the originating ring (which allows
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* determination of the edge role in collapse cases).
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*
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* For each input geometry, the label indicates that an edge
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* is in one of the following states (identified by the "dim" field).
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* Each state has some additional information about the edge.
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*
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* * A Boundary edge of an input Area (polygon)
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*
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* * dim = DIM_BOUNDARY
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* * locLeft, locRight : the locations of the edge sides for the input Area
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* * isHole : whether the edge was in a shell or a hole
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*
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* * A Collapsed edge of an input Area
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* (which had two or more parent edges)
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*
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* * dim = DIM_COLLAPSE
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* * locLine : the location of the
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* edge relative to the input Area
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* * isHole : whether some
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* contributing edge was in a shell (false),
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* or otherwise that all were in holes (true)
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*
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* * An edge from an input Line
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*
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* * dim = DIM_LINE
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* * locLine : initialized to LOC_UNKNOWN, to simplify logic.
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*
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* * An edge which is Not Part of an input geometry
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* (and thus must be part of the other geometry).
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*
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* * dim = NOT_PART
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*
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* Note that:
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*
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* * an edge cannot be both a Collapse edge and a Line edge in the same input geometry,
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* because each input geometry must be homogeneous.
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* * an edge may be an Boundary edge in one input geometry
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* and a Line or Collapse edge in the other input.
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*
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* @author Martin Davis
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*/
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class GEOS_DLL OverlayLabel {
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private:
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// Members
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int aDim = DIM_NOT_PART;
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bool aIsHole = false;
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Location aLocLeft = LOC_UNKNOWN;
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Location aLocRight = LOC_UNKNOWN;
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Location aLocLine = LOC_UNKNOWN;
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int bDim = DIM_NOT_PART;
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bool bIsHole = false;
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Location bLocLeft = LOC_UNKNOWN;
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Location bLocRight = LOC_UNKNOWN;
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Location bLocLine = LOC_UNKNOWN;
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std::string dimensionSymbol(int dim) const;
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void locationString(uint8_t index, bool isForward, std::ostream& os) const;
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public:
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static constexpr Location LOC_UNKNOWN = Location::NONE;
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enum {
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DIM_UNKNOWN = -1,
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DIM_NOT_PART = -1,
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DIM_LINE = 1,
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DIM_BOUNDARY = 2,
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DIM_COLLAPSE = 3
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};
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OverlayLabel()
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: aDim(DIM_NOT_PART)
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, aIsHole(false)
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, aLocLeft(LOC_UNKNOWN)
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, aLocRight(LOC_UNKNOWN)
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, aLocLine(LOC_UNKNOWN)
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, bDim(DIM_NOT_PART)
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, bIsHole(false)
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, bLocLeft(LOC_UNKNOWN)
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, bLocRight(LOC_UNKNOWN)
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, bLocLine(LOC_UNKNOWN) {};
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explicit OverlayLabel(uint8_t p_index)
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: OverlayLabel()
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{
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initLine(p_index);
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};
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OverlayLabel(uint8_t p_index, Location p_locLeft, Location p_locRight, bool p_isHole)
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: OverlayLabel()
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{
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initBoundary(p_index, p_locLeft, p_locRight, p_isHole);
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};
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int dimension(uint8_t index) const { return index == 0 ? aDim : bDim; };
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void initBoundary(uint8_t index, Location locLeft, Location locRight, bool p_isHole);
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void initCollapse(uint8_t index, bool p_isHole);
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void initLine(uint8_t index);
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void initNotPart(uint8_t index);
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/**
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* Sets the line location.
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*
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* This is used to set the locations for linear edges
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* encountered during area label propagation.
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*
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* @param index source to update
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* @param loc location to set
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*/
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void setLocationLine(uint8_t index, Location loc);
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void setLocationAll(uint8_t index, Location loc);
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void setLocationCollapse(uint8_t index);
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/*
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* Tests whether at least one of the sources is a Line.
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*
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* @return true if at least one source is a line
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*/
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bool isLine() const
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{
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return aDim == DIM_LINE || bDim == DIM_LINE;
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};
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bool isLine(uint8_t index) const
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{
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return index == 0 ? aDim == DIM_LINE : bDim == DIM_LINE;
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};
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bool isLinear(uint8_t index) const
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{
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if (index == 0) {
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return aDim == DIM_LINE || aDim == DIM_COLLAPSE;
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}
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return bDim == DIM_LINE || bDim == DIM_COLLAPSE;
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};
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bool isKnown(uint8_t index) const
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{
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if (index == 0) {
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return aDim != DIM_UNKNOWN;
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}
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return bDim != DIM_UNKNOWN;
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};
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bool isNotPart(uint8_t index) const
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{
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if (index == 0) {
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return aDim == DIM_NOT_PART;
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}
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return bDim == DIM_NOT_PART;
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};
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bool isBoundaryEither() const
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{
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return aDim == DIM_BOUNDARY || bDim == DIM_BOUNDARY;
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};
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bool isBoundaryBoth() const
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{
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return aDim == DIM_BOUNDARY && bDim == DIM_BOUNDARY;
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};
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/**
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* Tests if the label is for a collapsed
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* edge of an area
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* which is coincident with the boundary of the other area.
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*
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* @return true if the label is for a collapse coincident with a boundary
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*/
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bool isBoundaryCollapse() const
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{
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if (isLine()) return false;
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return ! isBoundaryBoth();
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};
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/**
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* Tests if a label is for an edge where two
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* area touch along their boundary.
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*/
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bool isBoundaryTouch() const
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{
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return isBoundaryBoth() &&
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getLocation(0, Position::RIGHT, true) != getLocation(1, Position::RIGHT, true);
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};
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bool isBoundary(uint8_t index) const
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{
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if (index == 0) {
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return aDim == DIM_BOUNDARY;
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}
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return bDim == DIM_BOUNDARY;
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};
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bool isLineLocationUnknown(int index) const
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{
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if (index == 0) {
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return aLocLine == LOC_UNKNOWN;
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}
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else {
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return bLocLine == LOC_UNKNOWN;
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}
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};
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/**
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* Tests whether a label is for an edge which is a boundary of one geometry
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* and not part of the other.
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*/
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bool isBoundarySingleton() const
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{
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if (aDim == DIM_BOUNDARY && bDim == DIM_NOT_PART) {
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return true;
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}
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if (bDim == DIM_BOUNDARY && aDim == DIM_NOT_PART) {
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return true;
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}
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return false;
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};
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/**
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* Tests if a line edge is inside
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* @param index
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* @return
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*/
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bool isLineInArea(int8_t index) const
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{
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if (index == 0) {
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return aLocLine == Location::INTERIOR;
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}
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return bLocLine == Location::INTERIOR;
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};
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bool isHole(uint8_t index) const
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{
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if (index == 0) {
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return aIsHole;
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}
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else {
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return bIsHole;
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}
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};
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bool isCollapse(uint8_t index) const
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{
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return dimension(index) == DIM_COLLAPSE;
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};
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Location getLineLocation(uint8_t index) const
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{
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if (index == 0) {
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return aLocLine;
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}
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else {
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return bLocLine;
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}
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};
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/**
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* Tests if a label is a Collapse has location INTERIOR,
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* to at least one source geometry.
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*/
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bool isInteriorCollapse() const
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{
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if (aDim == DIM_COLLAPSE && aLocLine == Location::INTERIOR)
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return true;
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if (bDim == DIM_COLLAPSE && bLocLine == Location::INTERIOR)
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return true;
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return false;
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};
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/**
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* Tests if a label is a Collapse
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* and NotPart with location INTERIOR for the other geometry.
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*/
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bool isCollapseAndNotPartInterior() const;
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/**
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* Tests if a line is in the interior of a source geometry.
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*
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* @param index source geometry
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* @return true if the label is a line and is interior
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*/
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bool isLineInterior(uint8_t index) const
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{
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if (index == 0) {
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return aLocLine == Location::INTERIOR;
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}
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return bLocLine == Location::INTERIOR;
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};
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/**
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* Gets the location for this label for either
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* a Boundary or a Line edge.
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* This supports a simple determination of
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* whether the edge should be included as a result edge.
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*
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* @param index the source index
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* @param position the position for a boundary label
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* @param isForward the direction for a boundary label
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* @return the location for the specified position
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*/
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Location getLocationBoundaryOrLine(
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uint8_t index,
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int position,
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bool isForward) const
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{
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if (isBoundary(index)) {
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return getLocation(index, position, isForward);
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}
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return getLineLocation(index);
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};
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/**
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* Gets the linear location for the given source.
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*
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* @param index the source index
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* @return the linear location for the source
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*/
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Location getLocation(uint8_t index) const {
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if (index == 0) {
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return aLocLine;
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}
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return bLocLine;
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};
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Location getLocation(uint8_t index, int position, bool isForward) const;
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bool hasSides(uint8_t index) const {
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if (index == 0) {
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return aLocLeft != LOC_UNKNOWN
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|| aLocRight != LOC_UNKNOWN;
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}
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return bLocLeft != LOC_UNKNOWN
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|| bLocRight != LOC_UNKNOWN;
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};
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OverlayLabel copy() const
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{
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OverlayLabel lbl = *this;
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return lbl;
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};
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friend std::ostream& operator<<(std::ostream& os, const OverlayLabel& ol);
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void toString(bool isForward, std::ostream& os) const;
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};
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} // namespace geos.operation.overlayng
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} // namespace geos.operation
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} // namespace geos
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